Improvement in spirit-levels



B. F. BURLINGTON 8a L. H. PRIEST. SPIRIT-LEVELS. 10.182,801", Patented061.31876.

WITNESSES INVENTOR.

.Attorney ^N.PETERS. PHDTO-UTHOGHAPHER. WASHINGTON, Dv C.

UNITED STATES 'PATENT OFFICE.,

BURKNER F. BURLINGTON AND LEWIS H. PRIEST, OF SOUTH LANCASTER,MASSACHUSETTS; SAID BURLINGTON ASSIGNOR TO SAID PRIEST.

IMPROVEMENT IN SPIRIT-LEVELS.

Specification forming part of Letters Patent No. 182,801, dated October3, 1876; application filed Maren 11,1876.

To all whom it may concern:

Be it known that we, BURKNER F. BUR- LINGTON and LEwIs H. PRIEST, ofSouth Lancaster, in the county of Worcester and State drawings, and tothe letters of reference marked thereon, which form part of thisspecication.

Our invention relates to spirit-levels and it consists in providing theglass tube with a rubber covering. It also consists in a bent tube withone or two arms or legs extending at right angles, so as to make asingle or double plumb and level with one bulb, all as hereinafter morefully set forth.

In order to enable others skilled in the art to which our inventionappertains to make and use the same, we will now proceed to describe itsconstruction and operation, referring to the annexed drawing, in whichiFigure l is a longitudinal section of a spirit-level embodying ourinvention. Fig. 2 is a section of an angular tube used therein.

A represents the usual stock for spirit-levels. At B we show a singleglass tube, inserted and held in the stock in the ordinary manner.Before inserting and fastening the tube B a rubber tube, C, is placedaround the same, said rubber tube having a hole out in its center ontop.

By the use of this elastic tube the glass tube is not liable to befractured or broken. This part of our invention is applicable to alltubes for spirit-levels.

D represents a glassA tube having its ends bent at right angles to formarms or legs D' D', as shown, forming one continuous tube. This benttube is inserted in the stock A, with the ordinary metal frame E in theedge of the stock over the main part D, while in the stock are madeapertures G 'G for the arms D to be seen.

The tube D may be provided with an arm or leg, D', at one end only, ifso desired.

By this construction we are enabled to form a single or double plumb and`level with but one bulb.

Having thus fully described our invention, what we claim as new, anddesire to secure by Letters Patent, is-

1. In combination with a glass tube for a spirit-level, an elastic tube,inclosin g the same, and provided withV an opening on top, for thepurposes herein set forth. Y

2. In spirit-levels, a bent tube, formed with one or two arms or legs atright angles, for the purposes herein set forth.

In testimony that we claim the foregoing as our own We affix oursignatures in presence of two witnesses.

BUEKN. E. BURLINGTON. LEwIs E. PEIEsT.

